Messenger: Frontier Fairness

Candidate: Michael Johnston

Contest: Governor

About the message: This is one of at least two mailers the independent spending group Frontier Fairness sent to Boulder County residents encouraging them to support former state Sen. Michael Johnston in the June 26 Democratic gubernatorial primary.

The mailer lists mass shootings, including Columbine and Aurora, and says "No one should be next," with a photo of Johnston.

About the messenger: Frontier Fairness is an independent spending committee supporting former Democratic state Sen. Michael Johnston in the governor's race.

The messenger's money: Among the major donors to Frontier Fairness are former New York City mayor and businessman Michael Bloomberg at $2 million and LinkedIn founder Reid Hoffman at $1 million; $100,000 from DaVita CEO Kent Thiry (who was once registered as a Republican); $500,000 each from hedge fund manager Stephen Mandel and his wife Susan. Kelley of Denver venture capital firm Vestar and Eric and Sara Resnick, of Vail, at $50,000 each. Also: $2,500 each from acting couple Felicity Huffman and William Macy.James